Jayson Tatum scored 10 of his 36 points in overtime and the Boston Celtics capitalised on some sloppy play by the Indiana Pacers for a 133-128 victory in Game 1 of the Eastern Conference finals on Tuesday night.

Jrue Holiday had 28 points and Jaylen Brown added 26, none bigger than his tying 3-pointer with 6.1 seconds left in regulation.

The Celtics finished with 11 steals - three each by Brown, Tatum and Holiday. They became the first team in NBA playoff history to have three players record 25 points and three steals in a game. 

Game 2 is Thursday night in Boston.

Tyrese Haliburton had 25 points and 10 assists for the Pacers, who scored 56 points in the paint against a Celtics team missing injured 7-footer Kristaps Porziņģis. The Pacers, though, committed 21 turnovers.

Indiana twice turned the ball over with a three-point lead in the final 30 seconds of regulation. Brown’s 3 from the corner with Pascal Siakam in his face tied it at 117.

Tyrese Haliburton sank three free throws after he was fouled with 1:46 to go in overtime to put the Pacers ahead 123-121, but Tatum completed a three-point play 34 seconds later to give Boston the lead for good.

Tatum’s 3 following another Indiana turnover with 43 seconds left extended the lead, and he hit two free throws with nine seconds left to seal the win.